Form Title:
Document #:
INSTALLATION AND MAINTENANCE MANUAL
MM-CH004
(Form: DEF-006A-1)
Revision:
0
Document Title:
Date:
EXTERNAL CHEMICAL HYDRAULIC VALVE
Oct. 20, 2020
Page:
8 of 10
Betts Industries Inc.
▪
814·723·1250
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1800 Pennsylvania Ave. West
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Warren, PA 16365
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Print Date: 1/22/2021
This form is considered uncontrolled 24 hrs. after print date.
Do NOT press main seal (16) into place by hand. Simply place as shown above,
apply high quality anti-seize compound to threads of seal retainer (18) and screw
back onto lower stem (14). This will seat the main seal (16) in place without
damage.
Remove main spring (13), washer
– main spring (11), packing spring (10), and
follower washer (9). Inspect for damage on these parts and replace if necessary.
Use care not to damage stuffing box, remove old packing (8) and wiper (7).
Clean and inspect stuffing box where packing (8) and wiper (7) are located.
•
If the stuffing box is scratched and/or pitted, the valve body (12) must be
replaced.
Remove seat (5) using care to prevent damage or
scratches to the seat area of the flange.
•
Inspect seat area of flange. Valve body must be
replaced if there is any pitting or damage in this
area.
Place new seat (5) into seat area of flange, being
sure that it is completely installed into groove.
Holding the cap collar (2), removed the cap nut (1)
from the upper stem (6) and remove the disc from
the upper stem (6).
Carefully remove the O-ring (3) from the underside
of the disc (4). Inspect the groove and disc (4) for
any pitting or damage. Replace with new parts if
needed.
Inspect upper stem (6).
•
Replace upper stem (6) if it is scratched and/or
pitted enough to not be easily removed by
polishing.
Install new O-ring (3) into disc (4) and reinstall disc
(4), cap collar (2), and cap nut (1) to upper stem (6).
While holding the cap collar (2), torque cap nut (1)
to approximately 40 ft-lbs.
Hold cap collar (2) of disc/upper stem assembly in
vice and lower valve body (12) over upper stem
half/disc assembly into valve and install new wiper
(7) and packing (8) in orientation shown in parts list
in section 2.
